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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
That version is abandoned and has quite a few severe bugs. There is a GPL fork which is maintained https://github.com/virtualsquare/picotcp
Yes. I found it was quite possible to code up TCP/IP from scratch for my own tiny (arguably toy) bare metal environment here https://github.com/billforsternz/bmz
Low level library https://github.com/soypat/ether-swtch
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.